Investigation of the Solid Electrolyte Interphase Formed by Fluoroethylene Carbonate on Si Electrodes

The solid electrolyte interphase (SEI) formed by a fluoroethylene carbonate (FEC)-based electrolyte on a Si electrode was investigated using X-ray photoelectron spectroscopy (XPS) and time of flight–secondary ion mass spectrometry (ToF-SIMS). The FEC-derived SEI consists of lithium fluoride and a po...

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Bibliographic Details
Published inJournal of the Electrochemical Society Vol. 158; no. 7; pp. A798 - A801
Main Authors Nakai, Hideki, Kubota, Tadahiko, Kita, Akinori, Kawashima, Atsumichi
Format Journal Article
LanguageEnglish
Published 01.01.2011
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Summary:The solid electrolyte interphase (SEI) formed by a fluoroethylene carbonate (FEC)-based electrolyte on a Si electrode was investigated using X-ray photoelectron spectroscopy (XPS) and time of flight–secondary ion mass spectrometry (ToF-SIMS). The FEC-derived SEI consists of lithium fluoride and a polyene-compound, which are originated from free fluoride and the acetylene unit due to the preferential reaction of FEC, and is very thin. Oxidation of the Si electrode of the EC-based cell was confirmed, although it did not proceed to a significant extent. The FEC-derived SEI protects against not only the decomposition of the FEC-based electrolyte, but also oxidation of the Si electrode. The FEC-derived SEI acts as a passivation film for the Si electrode, which results in the improvement of the cycling performance.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.3589300